How can we handle resubmition form popup in Google Chrome
Use a check app State to get whether the pop up is coming,
Once it has appeared try clicking on Continue Button!
With Send Windows Message and For getting the correct selector you might need to change mode.
Use the Check app state activity which is used to check the element (popup) is exist on the screen.
There are two blocks in check app state as shown below in the image.
If the element is appear (popup is thrown by google chrome) on the screen then give the activity what to do in Target Appears block
If the element is not appear (popup is not thrown by google chrome) on the screen then give the activity what to do in Target does not appear block
Hope it helps!!
Also consider the reason for the popup.
You navigate ‘back’ to a page created after a form submit. This can have various effects of the contents of the page, or its data processing (what happens if a form is resubmitted?). You might want to consider avoiding this at all. (Also it saves you from dealing with the annoying popup 
)
If your goal is to navigate to a specific page, even if it is one you visited earlier that session, try looking for a way ‘forward’ to reach that page. If it requires a click or two extra, you’ll still probably gain stability in your automation.
If you need to reclick multiple times consider using retry scope activity with a condition with what happens after the click happens successfully
But it is first good to consider if clicking solves the issue or something needs to be corrected in the form
Cheers